In one study of healthy infants, the response to testing was extensor in The extensor response usually disappears - giving way to the flexor response - by 12 months of age.

Nociception detected in the S1 dermatome and travels up the tibial nerve to the sciatic nerve to roots of L5,S1 and synapse in the anterior horn to elicit the motor response.

Motor response back through the L5,S1 roots to the sciatic nerve to its bifurcation. Toe flexors are innervated by the tibial nerve. Toe extensors extensor hallicus longus, extensor digitorum longus are innervated by the deep peroneal nerve.

The pathway producing the plantar response is more complicated, and is not monosynaptic. The plantar reflex can be elicited in a number of ways, which were described in the late 19th and early 20th century.

These have their own eponyms. From Wikipedia, the free encyclopedia. If the reflex occurs in adults as illustrated at bottom it may be due to nerve damage or disease.